“We made a demo and it was amazing; we had a blast,” said Ingrosso, a few hours prior to his second night headlining New York’s Roseland Ballroom solo — his first time in NYC since Swedish House Mafia played a sold-out Madison Square Garden in December. “Ellie is a great artist… her voice is amazing. Skrillex, enough said, he is Skrillex.”

Ingrosso admitted that he and Angello were “scared” before the session, but had a bit of extra time to prepare.“Ellie and Skrillex came in 30 minutes late, and we had already started with a melody. Skrillex freaked out, he loved it, and after a few hours we wrote the song.”

the session was set up by Interscope A&R Dave Rene, who has become a matchmaker of sorts for EDM artists, the major label behemoth, and pop stars. At Ingrosso’s request, Rene secured OneRepublic singer and hit songwriter Ryan Tedder to add a vocal line to “Calling,” Ingrosso and DJ/producer Alesso’s originally instrumental underground hit.